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tcpdump Cheat Sheet (https://www.comparitech.com/net-admin/tcpdump-cheat-sheet/)

Very good explanation how ARP in IPv4 works: https://www.tummy.com/articles/networking-basics-how-arp-works/ https://www.geeksforgeeks.org/arp-reverse-arprarp-inverse-arp-inarp-proxy-arp-and-gratuitous-arp/

IPv6 Commands Below are the most important helpful commands for checking and diagnosing the IPv6 environment Windows 8 / 10 Command Function ipconfig /all displays all interface details ping ::1 Test IPv6 protocol host internally (localhost) n...

Description This article describes the system global option "set cfg-save revert" that can be used during remote changes on a Fortigate and where the operator would like an automatic revert to the previous configuration in case of problems arise (if for exa...

Backing up the configuration Using the GUI Click on the user name in the upper right-hand corner of the screen and select Configuration > Backup. Direct the backup to your Local PCor to a USB Disk. The USB Disk option will not be available if no USB driv...

Sometimes it is neccessary to copy the partition-table of one disk to another. Mostly this is needed when a disk should be replaced on a software-raid-array. The method described here also works for GPT-Tables. Method for GPT Tables Backup the table of /dev/...

Overview about the system # inxi -pluFxxrm In this output you will find information about partitions, operating system, resource consumption, memory usage and also information about the repositories used.

Check Point ExportImportPolicyPackage tool enables you to export a policy package from a Management database to a .tar.gz file, which can then be imported into any other Management database. The tool is supported for version R80.10 and above. This tool can be...

Problem Fortigate VPN users reporting that they cannot connect to internal resources anymore.When you check the client the internal host is reachable by IP but it appears that windows isn't using the internal DNS server to resolve the host name. A check with ...

Sometimes there is a need to always run some terraform local-exec, so we can always execute a null_resource when doing an apply or applying it as a target. So, how can you make sure to invalidate state for the null resource, so it always runs the local-exec s...

Description To Merge an LTM config from a F5 to another F5 you need to split the bigip.conf file into seperate config files which you need then to import on the destination F5. Import the config parts with copy-paste into the terminal and with the following ...

In this example we're upgrade psql from version 10 to version 11. Install the new version root@srv01:~# apt install postgresql-11 List psql clusters root@srv01:~# pg_lsclusters Ver Cluster Port Status Owner    Data directory              Log file 10 ...

Connect to Zimbra LDAP Server zimbra @ mail: ~ $ zmlocalconfig -s zimbra_ldap_password ldap_master_url the result will be something like zimbra_ldap_password = thepassword ldap_master_url = ldap: // server: 389 Connect to the LDAP Server with LDAP Server...

iControlREST Home Find the documentation about the F5 REST-API here: https://clouddocs.f5.com/api/icontrol-rest/ Examples GTM Get GTM Pool fallbackIp curl -sku admin:<password> https://<f5-bigip>/mgmt/tm/gtm/pool/a\ | jq '.items[] | { name: .name, ip: ....

Fortinet offers for most appliances a demo access. You can use the following as an example: Product URL Login Authenticator https://fortiauthenticator.fortidemo.com UnknownRequest credentials here: https://www.fortinet.com/demo-center WEB...

If you need to apply an ALG (Application level gateway) on SQLNet be careful and check the following: SQL*Net (a.k.a Oracle TNS) and firewalls… Most vendor’s firewalls have a SQL ALG that handles SQL*Net traffic.They listen on TCP port 1521. SQL*Net is base...

If you need a list of interfaces and the actual speed and duplex settings use this: # ifconfig -a | grep encap | awk '{print $1}' | grep -v lo | grep -v bond | grep -v ":" \ | grep -v ^lo | xargs -I % sh -c 'ethtool %; ethtool -i %' | grep '^driver\|Speed\|D...

VPN Problems Links & Infos IKEv2 Internet Key Exchange Protocol Version 2 (IKEv2)https://tools.ietf.org/html/rfc5996 Check Point Probleme mit IKEv2 Site to Site using IKEv2 fails with "None of the traffic selectors match the conection"https://support.chec...

Introduction The following is a collection of troubleshooting I need to do with Check Point Threat Extraction R80.10.I used the Technical Reference Guide (ATRG) here: sk114807 Workflow in MTA mode A PostFix server receives and handles the emails.  Emails...

Link https://community.checkpoint.com/t5/Enterprise-Appliances-and-Gaia/GAIA-Easy-execute-CLI-commands-on-all-gateways-simultaneously/m-p/50883